<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>p1_CSS的三种位置</title>
    <link rel="stylesheet" href="01.css">
    <style>
        p{
            color: blue;
        }
        h4{
            border: 5px solid red;
        }
    </style>
</head>
<body>
<h4>我是标题</h4>
<h4 style="color: red; background-color:yellow ">我是标题</h4><!--行内样式-->
<h4>我是标题</h4>

<p>我是段落</p>
<p>我是段落</p>
<p>我是段落</p>

<div>我是div</div>
<div>我是div</div>
<div>我是div</div>
</body>
</html>